Stereophone ear plug



FIG. 1 is a front perspective view of a stereophone ear plug showing our new design;

FIG. 2 is a side elevational view thereof, with the opposite side being a mirror image;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a front view thereof; and,

FIG. 6 is a rear view thereof.

The broken line showing on FIGS. 2 and 4-6 is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a stereophone ear plug, as shown and described. 